期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 14, 页码 7564-7573出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.01.095
关键词
PEMFC; Localized electrochemical impedance spectroscopy; Printed circuit board; Cathode stoichiometry; Operating parameter optimisation; Current density distribution
资金
- Fundamental Research Funds for the Central Universities
- National Key Research and Development Program of China [2016YFB0101319]
- National Key Scientific Instrument and Equipment Development Special Fund [2012YQ150256]
Proton Exchange Membrane Fuel Cell can have a large active area, and the working condition in different areas can be entirely different. Localized electrochemical impedance spectroscopy can directly observe the proton exchange membrane fuel cell internal reaction conditions. In this work, localized electrochemical impedance spectroscopy test system based on print circuit board is implemented in a 50 cm(2) multi-channel serpentine flow fields. The localized electrochemical impedance spectroscopy performances of different segments with different cathode stoichiometry (1.8, 2.3 and 2.8) at different current density (100 mA cm(-2), 500 mA cm(-2) and 900 mA cm(-2)) are studied. The result demonstrates that the fuel cell may suffer from local drying and flooding at the same time. To make full use of the potential of a fuel cell, a suitable cathode stoichiometry should be identified to control the drying of the inlet and the flooding of the outlet at the same time. It is shown that a cathode stoichiometry of 2.3 is close to the optimum cathode stoichiometry to keep the fuel cell in good consistency without gas waste. Besides, a current density distribution measurement is performed to verify the conclusions of this work. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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